Of Habitat Fragmentation Jankowski 's Bunting

This study focus on Jankowski's Bunting population distributing over the juncture of west of Jilin Province and Inner Mongolia Autonomous Region, China. The content of this study include: the effect of habitat fragmentation on Jankowski's Bunting population and birds community, the habitat selection of Jankowski's Bunting, analyses of variation in quantity of Jankowski's Bunting.In study of the effect of habitat fragmentation on Jankowski's Bunting population and birds community, habitat over which Jankowski's Bunting distributing was divided into 11 patches, area, perimeter of each patch and distances between every two patches were measured, landscape fragmentation indexes were calculated, and quantities of Jankowski's Bunting individual and birds species were counted. The analytical results showed that neither quantity of Jankowski's Bunting nor number of birds species significant correlated to areas of the patches, both of them were influenced by human disturbance and habitat spatial heterogeneity. Only landscape shape fragmentation index (FS) among all landscape fragmentation indexes correlated to the quantity of Jankowski's Bunting.In study of the habitat selection of Jankowski's Bunting, ten quadrats (1 X 1 m) were selected in each patch, the species, quantities and mean heights of plants were recorded. And method of Principle Component Analysis was used to analyse these data, the results showed that the main factors which influence habitat selection of Jankowski's Bunting include: character of Carey, spp. , character of Arundinella hirta, chatacter of Lespedeza bicolor, character of Stipa baicalensis, etc..When analysed variation in quantity of Jankowski's Bunting, data of population quantity of this kind of birds were analysed to find out why they had continued decreasing. The results showed that the main causeswere that human disturbance and megathermal and dry climate.